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<title>web.xml Visual Editor: Context Parameters</title>
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<h1>web.xml Visual Editor: Context Parameters</h1>
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<p>Use the Context Parameters section in the <code dir="ltr">web.xml</code>Visual Editor to add, remove, and view the web application's context parameters. Context parameters are initialization parameters that are available throughout a web application. You can use them, for example, to provide configuration information to all servlets and JSP pages in a web application. 
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<p>You can access context parameters in your code using the <code dir="ltr">javax.servlet.ServletContext.getInitParameter()</code> and <code dir="ltr">javax.servlet.ServletContext.getInitParameterNames()</code> methods, as shown in <a href="#CHDDHBHI">Example: Methods to access context parameters in code</a>.</p>
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<p>Example: Methods to access context parameters in code</p>
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ServletContext context = this.getServletContext();
String mainPage = context.getInitParameter("mainPage");
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<p>If a company name changes frequently, you can define its value as a context parameter in the <code dir="ltr">web.xml</code> file instead of hard-coding it in all your JSP files and servlets. Then define and declare a listener that reads the value and stores it in the servlet context. Next, define and declare another listener that monitors changes to the name.</p>
<p>To declare a context parameter, you must register it in the <code dir="ltr">web.xml</code> file. When you do this, you provide information needed by the server to use the parameter. You tell the server which value should be returned when a context parameter is referred to in the web application.</p>
<p>In the Visual Editor, click <b>General</b> at the top of the editor to open the General section, then click the Context Parameters header to open the Context Parameters section.</p>
<p>Click <b>Add</b> to define the context parameter element with the following properties:</p>

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<th align="left" valign="bottom" id="r1c1-t4">Element</th>
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<p>Param Name</p>
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<td align="left" headers="r2c1-t4 r1c2-t4">Specifies the parameter's name, such as <code dir="ltr">MyCompanyName</code>. 
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<param name="content" value="http://www.oracle.com/pls/topic/lookup?ctx=nb8200&id=NBDAG1114">
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<p>Param Value</p>
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<td align="left" headers="r3c1-t4 r1c2-t4">Specifies the parameter's value, such as <code dir="ltr">Sand For Africa Inc</code>. 
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<p>Description</p>
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<td align="left" headers="r4c1-t4 r1c2-t4">Specifies a description, such as <code dir="ltr">Current name of my company</code>. 
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<param name="content" value="http://www.oracle.com/pls/topic/lookup?ctx=nb8200&id=NBDAG1114">
<param name="text" value="<html><u>How?</u></html>">
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<hr><p><b>Related Topics</b></p>
<p><i>Developing Applications with NetBeans IDE</i>, 
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<p><i>Developing Applications with NetBeans IDE</i>, 
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<param name="content" value="http://www.oracle.com/pls/topic/lookup?ctx=nb8200&id=NBDAG1111">
<param name="text" value="<html><u>&quot;Configuring a Web Application&quot;</u></html>">
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